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- #include <stdio.h>
- #include <string.h>
- int
- add(int a, int b) {
- return a + b;
- }
- int
- sub(int a, int b) {
- return a - b;
- }
- int main(int argc, char *argv[])
- {
- int (*fp)();
- if(argc != 4) {
- printf("WRONG\n");
- return 1;
- }
- if(strcmp(argv[1], "+") == 0) {
- fp = add;
- } else if(strcmp(argv[1], "-") == 0) {
- fp = sub;
- } else {
- printf("use + 2 3\n - 4 2\n");
- return 1;
- }
- printf("%d\n", (*fp)(atoi(argv[2]), atoi(argv[3])));
- return 0;
- }
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